1 /*
2 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 */
8
9 #include <linux/ptrace.h>
10 #include <linux/tracehook.h>
11 #include <linux/sched/task_stack.h>
12 #include <linux/regset.h>
13 #include <linux/unistd.h>
14 #include <linux/elf.h>
15
task_callee_regs(struct task_struct * tsk)16 static struct callee_regs *task_callee_regs(struct task_struct *tsk)
17 {
18 struct callee_regs *tmp = (struct callee_regs *)tsk->thread.callee_reg;
19 return tmp;
20 }
21
genregs_get(struct task_struct * target,const struct user_regset * regset,unsigned int pos,unsigned int count,void * kbuf,void __user * ubuf)22 static int genregs_get(struct task_struct *target,
23 const struct user_regset *regset,
24 unsigned int pos, unsigned int count,
25 void *kbuf, void __user *ubuf)
26 {
27 const struct pt_regs *ptregs = task_pt_regs(target);
28 const struct callee_regs *cregs = task_callee_regs(target);
29 int ret = 0;
30 unsigned int stop_pc_val;
31
32 #define REG_O_CHUNK(START, END, PTR) \
33 if (!ret) \
34 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, PTR, \
35 offsetof(struct user_regs_struct, START), \
36 offsetof(struct user_regs_struct, END));
37
38 #define REG_O_ONE(LOC, PTR) \
39 if (!ret) \
40 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, PTR, \
41 offsetof(struct user_regs_struct, LOC), \
42 offsetof(struct user_regs_struct, LOC) + 4);
43
44 #define REG_O_ZERO(LOC) \
45 if (!ret) \
46 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, \
47 offsetof(struct user_regs_struct, LOC), \
48 offsetof(struct user_regs_struct, LOC) + 4);
49
50 REG_O_ZERO(pad);
51 REG_O_ONE(scratch.bta, &ptregs->bta);
52 REG_O_ONE(scratch.lp_start, &ptregs->lp_start);
53 REG_O_ONE(scratch.lp_end, &ptregs->lp_end);
54 REG_O_ONE(scratch.lp_count, &ptregs->lp_count);
55 REG_O_ONE(scratch.status32, &ptregs->status32);
56 REG_O_ONE(scratch.ret, &ptregs->ret);
57 REG_O_ONE(scratch.blink, &ptregs->blink);
58 REG_O_ONE(scratch.fp, &ptregs->fp);
59 REG_O_ONE(scratch.gp, &ptregs->r26);
60 REG_O_ONE(scratch.r12, &ptregs->r12);
61 REG_O_ONE(scratch.r11, &ptregs->r11);
62 REG_O_ONE(scratch.r10, &ptregs->r10);
63 REG_O_ONE(scratch.r9, &ptregs->r9);
64 REG_O_ONE(scratch.r8, &ptregs->r8);
65 REG_O_ONE(scratch.r7, &ptregs->r7);
66 REG_O_ONE(scratch.r6, &ptregs->r6);
67 REG_O_ONE(scratch.r5, &ptregs->r5);
68 REG_O_ONE(scratch.r4, &ptregs->r4);
69 REG_O_ONE(scratch.r3, &ptregs->r3);
70 REG_O_ONE(scratch.r2, &ptregs->r2);
71 REG_O_ONE(scratch.r1, &ptregs->r1);
72 REG_O_ONE(scratch.r0, &ptregs->r0);
73 REG_O_ONE(scratch.sp, &ptregs->sp);
74
75 REG_O_ZERO(pad2);
76
77 REG_O_ONE(callee.r25, &cregs->r25);
78 REG_O_ONE(callee.r24, &cregs->r24);
79 REG_O_ONE(callee.r23, &cregs->r23);
80 REG_O_ONE(callee.r22, &cregs->r22);
81 REG_O_ONE(callee.r21, &cregs->r21);
82 REG_O_ONE(callee.r20, &cregs->r20);
83 REG_O_ONE(callee.r19, &cregs->r19);
84 REG_O_ONE(callee.r18, &cregs->r18);
85 REG_O_ONE(callee.r17, &cregs->r17);
86 REG_O_ONE(callee.r16, &cregs->r16);
87 REG_O_ONE(callee.r15, &cregs->r15);
88 REG_O_ONE(callee.r14, &cregs->r14);
89 REG_O_ONE(callee.r13, &cregs->r13);
90
91 REG_O_ONE(efa, &target->thread.fault_address);
92
93 if (!ret) {
94 if (in_brkpt_trap(ptregs)) {
95 stop_pc_val = target->thread.fault_address;
96 pr_debug("\t\tstop_pc (brk-pt)\n");
97 } else {
98 stop_pc_val = ptregs->ret;
99 pr_debug("\t\tstop_pc (others)\n");
100 }
101
102 REG_O_ONE(stop_pc, &stop_pc_val);
103 }
104
105 return ret;
106 }
107
genregs_set(struct task_struct * target,const struct user_regset * regset,unsigned int pos,unsigned int count,const void * kbuf,const void __user * ubuf)108 static int genregs_set(struct task_struct *target,
109 const struct user_regset *regset,
110 unsigned int pos, unsigned int count,
111 const void *kbuf, const void __user *ubuf)
112 {
113 const struct pt_regs *ptregs = task_pt_regs(target);
114 const struct callee_regs *cregs = task_callee_regs(target);
115 int ret = 0;
116
117 #define REG_IN_CHUNK(FIRST, NEXT, PTR) \
118 if (!ret) \
119 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, \
120 (void *)(PTR), \
121 offsetof(struct user_regs_struct, FIRST), \
122 offsetof(struct user_regs_struct, NEXT));
123
124 #define REG_IN_ONE(LOC, PTR) \
125 if (!ret) \
126 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, \
127 (void *)(PTR), \
128 offsetof(struct user_regs_struct, LOC), \
129 offsetof(struct user_regs_struct, LOC) + 4);
130
131 #define REG_IGNORE_ONE(LOC) \
132 if (!ret) \
133 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, \
134 offsetof(struct user_regs_struct, LOC), \
135 offsetof(struct user_regs_struct, LOC) + 4);
136
137 REG_IGNORE_ONE(pad);
138
139 REG_IN_ONE(scratch.bta, &ptregs->bta);
140 REG_IN_ONE(scratch.lp_start, &ptregs->lp_start);
141 REG_IN_ONE(scratch.lp_end, &ptregs->lp_end);
142 REG_IN_ONE(scratch.lp_count, &ptregs->lp_count);
143
144 REG_IGNORE_ONE(scratch.status32);
145
146 REG_IN_ONE(scratch.ret, &ptregs->ret);
147 REG_IN_ONE(scratch.blink, &ptregs->blink);
148 REG_IN_ONE(scratch.fp, &ptregs->fp);
149 REG_IN_ONE(scratch.gp, &ptregs->r26);
150 REG_IN_ONE(scratch.r12, &ptregs->r12);
151 REG_IN_ONE(scratch.r11, &ptregs->r11);
152 REG_IN_ONE(scratch.r10, &ptregs->r10);
153 REG_IN_ONE(scratch.r9, &ptregs->r9);
154 REG_IN_ONE(scratch.r8, &ptregs->r8);
155 REG_IN_ONE(scratch.r7, &ptregs->r7);
156 REG_IN_ONE(scratch.r6, &ptregs->r6);
157 REG_IN_ONE(scratch.r5, &ptregs->r5);
158 REG_IN_ONE(scratch.r4, &ptregs->r4);
159 REG_IN_ONE(scratch.r3, &ptregs->r3);
160 REG_IN_ONE(scratch.r2, &ptregs->r2);
161 REG_IN_ONE(scratch.r1, &ptregs->r1);
162 REG_IN_ONE(scratch.r0, &ptregs->r0);
163 REG_IN_ONE(scratch.sp, &ptregs->sp);
164
165 REG_IGNORE_ONE(pad2);
166
167 REG_IN_ONE(callee.r25, &cregs->r25);
168 REG_IN_ONE(callee.r24, &cregs->r24);
169 REG_IN_ONE(callee.r23, &cregs->r23);
170 REG_IN_ONE(callee.r22, &cregs->r22);
171 REG_IN_ONE(callee.r21, &cregs->r21);
172 REG_IN_ONE(callee.r20, &cregs->r20);
173 REG_IN_ONE(callee.r19, &cregs->r19);
174 REG_IN_ONE(callee.r18, &cregs->r18);
175 REG_IN_ONE(callee.r17, &cregs->r17);
176 REG_IN_ONE(callee.r16, &cregs->r16);
177 REG_IN_ONE(callee.r15, &cregs->r15);
178 REG_IN_ONE(callee.r14, &cregs->r14);
179 REG_IN_ONE(callee.r13, &cregs->r13);
180
181 REG_IGNORE_ONE(efa); /* efa update invalid */
182 REG_IGNORE_ONE(stop_pc); /* PC updated via @ret */
183
184 return ret;
185 }
186
187 #ifdef CONFIG_ISA_ARCV2
arcv2regs_get(struct task_struct * target,const struct user_regset * regset,unsigned int pos,unsigned int count,void * kbuf,void __user * ubuf)188 static int arcv2regs_get(struct task_struct *target,
189 const struct user_regset *regset,
190 unsigned int pos, unsigned int count,
191 void *kbuf, void __user *ubuf)
192 {
193 const struct pt_regs *regs = task_pt_regs(target);
194 int ret, copy_sz;
195
196 if (IS_ENABLED(CONFIG_ARC_HAS_ACCL_REGS))
197 copy_sz = sizeof(struct user_regs_arcv2);
198 else
199 copy_sz = 4; /* r30 only */
200
201 /*
202 * itemized copy not needed like above as layout of regs (r30,r58,r59)
203 * is exactly same in kernel (pt_regs) and userspace (user_regs_arcv2)
204 */
205 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, ®s->r30,
206 0, copy_sz);
207
208 return ret;
209 }
210
arcv2regs_set(struct task_struct * target,const struct user_regset * regset,unsigned int pos,unsigned int count,const void * kbuf,const void __user * ubuf)211 static int arcv2regs_set(struct task_struct *target,
212 const struct user_regset *regset,
213 unsigned int pos, unsigned int count,
214 const void *kbuf, const void __user *ubuf)
215 {
216 const struct pt_regs *regs = task_pt_regs(target);
217 int ret, copy_sz;
218
219 if (IS_ENABLED(CONFIG_ARC_HAS_ACCL_REGS))
220 copy_sz = sizeof(struct user_regs_arcv2);
221 else
222 copy_sz = 4; /* r30 only */
223
224 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, (void *)®s->r30,
225 0, copy_sz);
226
227 return ret;
228 }
229
230 #endif
231
232 enum arc_getset {
233 REGSET_CMN,
234 REGSET_ARCV2,
235 };
236
237 static const struct user_regset arc_regsets[] = {
238 [REGSET_CMN] = {
239 .core_note_type = NT_PRSTATUS,
240 .n = ELF_NGREG,
241 .size = sizeof(unsigned long),
242 .align = sizeof(unsigned long),
243 .get = genregs_get,
244 .set = genregs_set,
245 },
246 #ifdef CONFIG_ISA_ARCV2
247 [REGSET_ARCV2] = {
248 .core_note_type = NT_ARC_V2,
249 .n = ELF_ARCV2REG,
250 .size = sizeof(unsigned long),
251 .align = sizeof(unsigned long),
252 .get = arcv2regs_get,
253 .set = arcv2regs_set,
254 },
255 #endif
256 };
257
258 static const struct user_regset_view user_arc_view = {
259 .name = UTS_MACHINE,
260 .e_machine = EM_ARC_INUSE,
261 .regsets = arc_regsets,
262 .n = ARRAY_SIZE(arc_regsets)
263 };
264
task_user_regset_view(struct task_struct * task)265 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
266 {
267 return &user_arc_view;
268 }
269
ptrace_disable(struct task_struct * child)270 void ptrace_disable(struct task_struct *child)
271 {
272 }
273
arch_ptrace(struct task_struct * child,long request,unsigned long addr,unsigned long data)274 long arch_ptrace(struct task_struct *child, long request,
275 unsigned long addr, unsigned long data)
276 {
277 int ret = -EIO;
278
279 pr_debug("REQ=%ld: ADDR =0x%lx, DATA=0x%lx)\n", request, addr, data);
280
281 switch (request) {
282 case PTRACE_GET_THREAD_AREA:
283 ret = put_user(task_thread_info(child)->thr_ptr,
284 (unsigned long __user *)data);
285 break;
286 default:
287 ret = ptrace_request(child, request, addr, data);
288 break;
289 }
290
291 return ret;
292 }
293
syscall_trace_entry(struct pt_regs * regs)294 asmlinkage int syscall_trace_entry(struct pt_regs *regs)
295 {
296 if (tracehook_report_syscall_entry(regs))
297 return ULONG_MAX;
298
299 return regs->r8;
300 }
301
syscall_trace_exit(struct pt_regs * regs)302 asmlinkage void syscall_trace_exit(struct pt_regs *regs)
303 {
304 tracehook_report_syscall_exit(regs, 0);
305 }
306
